With Vertical Lens, Yahoo lets you build your own vertical search engine. You get to mix and rerank your own site content with Yahoo search results, giving searchers relevant results both on and off site. Site content is indexed in real time, and content structure may be used by searchers to navigate and refine their searches. Ranking can be based on freshness, popularity or social factors. Yahoo Vertical Lens is a competitor of Google Site Search and Microsoft Live Search API’s.
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